Aiming　at　the　circulating　current　problem　of　multi-parallel　inverter　system　of　isolated　microgrid　due　to　the　inverter　internal　impedance　mismatch　and　line　impedance　mismatch,　the　paper　proposes　an　adaptive　virtual　complex　impedance　control　strategy　based　on　line　impedance　identification.　The　strategy　introduces　model　predictive　control　in　the　current　inner　loop　and　two-degree-of-freedom　control　algorithm　in　the　voltage　outer　loop　of　the　inverter,　and　then　constructs　the　line　impedance　identification　link　of　each　unit　and　introduces　adaptive　virtual　complex　impedance　based　on　the　identification　results.　The　paper　firstly　eliminates　the　influence　of　the　inverter　inner　impedance　and　improves　its　disturbance　immunity　through　the　voltage-current　double-loop　design,　and　secondly,　the　adaptive　virtual　complex　impedance　is　introduced　to　eliminate　the　circulating　current　problem　caused　by　the　mismatch　of　the　impedance　of　each　unit　line.　The　simulation　results　show　that　the　proposed　control　strategy　has　the　ability　to　effectively　suppress　the　circulating　current　problem　of　the　multi-inverter　parallel　system.　©　2025　Power　System　Technology　Press.　All　rights　reserved.